Joseph p



(No Model.)

J. P.v HUMBLB.

COFFEE MILL.

No. 881,074'. j PanemedApnylo, 1888.

I' @XMI/wao@ UNITED 'i STATES PATENT A`()1.jFIC`1.3`-lY .n e

JOSEPH P. HUMBLE, or PLAINFIELD, New.l JERSEY,

n c'o'FFeeflvllLLl.

SPECIFICATION forming part of Letters-Patent No. 381,074, dated April 10, 1888.

` Application niet July 19, nge-1: semi No. 244,765. (No model.) Y

To all whom it may con/cerm Be it known that l, JOSEPH P. HUMBLE, a citizen of the UnitedStates, residingat Plainfield, in the countyof Union and State of New Jersey, have invented-a new and useful Improvement in Coffee-Mills, f which the following is a specification.

My invention relatespto an improvement in.

Y coffee-mills; and it consists in a certain novel having bearings c c in the ends.

tical longitudinal section of the same. Fig. 3

is a transverse sectioniof the same. Fig. 4 is a detail view of one of the grinding-disks.

Referring by letter yto the drawings, A designates the shell or body of the mill, compris- Ving the circular case B, having the large central openings, b b, in the sides, covered on the outside bythe caps or cone-shaped boxes C C, The yupper sides of the said boxes C C, close to the circuf lar portion of the body, are provided with the lapertures C G'; and D designates a hopper disposed over the upper yside of the said circular body B and having theverticaltubes or ducts dd, leading down to and communicating at the lower` ends with the said apertures C C. rlhe upper side of the circular case in thecenter of the throat of the hopper has alblock', E, secured thereon, provided with beveled sides slanting in both directions, to divide the coviee or other material which is inserted into the hopper and direct it equallyfinto the two tubes G designates the horizontal shaft of the machine, to the outer ends of which are secured the power-wheelsH, and the said shaft is j ournaled in the bearings c c, formed in the ends `of the boxes C G. The said shaft G is formed in two parts-namely, the portion G', reduced at the inner end to form the shoulder g'and the stud or reduced portion g, and the hollow portion G2 having thelongitudinal recess gc therein and the threaded aperture g3 in the outer,v end to receive the adjusting thumb-screw I,

adapted to be passed intothe'end'ofthe shaft coiled around the studl g.. It will 'be seenthat the tendencyof thesaid spring is to pressthe.- l said shafts apart.

Inorder to enable the said shafts G and G2 to beturnedat the same' timewhich extends a considerable distance throughv v ythe longitudinal opening in the shaft. l

The stud g on the end of the shaftQGrv is that is, to cause them to move together-a r groove, h, is formed in the side of the recess r Y g2, anda corresponding rib or splineis formed' onthe side'of the stud g to fit in the said groove.

Thus, although the said shafts are capable of.

longitudinal movement with respect to'eachv other, they will 'always turn at the same time and with the same speed. L L are the grinding-disks,secured, respectively, on the inner ends of the shafts G G?, the Y outer `sides of the same being groovedk and ribbed concentrieally'and radially to operate in; proximity to the similarly grooved and vribbed inner surfaces of the sides of t-he circular case, as indicated in Fig. 2.

M M are conical bosses formed on'the'outer sides of the said disks to fit and operate in the f boxes C C on the sides ofthe case B, the said bosses being' provided with ribs and grooves arranged spirali y to operate close to the Vribbed and grooved inner surfacesof thesaid boxes.v It will be seen that whenV the power-wheels of themill are turned the shafts VG" and G2, and consequently the grinding-disks attached thereto,` will be rotated, and the coffee orother material, which is passed into the hopper 'D,

lar case of the mill and lbe finely powdered be- Y tween the youter surfaces of the said disks hand the inner surfaces ofthe case.

NN are small apertures formed in the lower side of thevcase B, aligned with the spaces beg` tween the outer sides of the disks and the sides ofthe case, and it will be seen that wheuthev i coffee `or other material has passed'between" the said disks and the sidesof the case and become thoroughly ground it Willy pass out of the mill through the said apertures NPN. l

The spring K between the ends of the shafts G G normally presses outwardly, and thus causes the disks to press against the sides of the case with a slighty-yielding,butsuiicientl y firm,pressure to insure the satisfactory grinding of the material placed between said disks and the case. It will be seen that the inward motion of the disks is limited by the end of the stud g striking against the inner end of the set-screw I in the end of the hollow shaft, and consequently, if it is desired to grind the material very fine, the said screw is screwed in, thus forcing the disks closer to the sides of the case, and if it is desired to allow the material to pass through in a coarser state the said screw is partly withdrawn and the disks permitted to yield when the coffee or other material passes between them and the sides of the CaSe.

The construction of this device, as will be seen, is very simple, and the advantage is gained of having two disksoperating at the same time, both being fed by the same hopper and grinding with the same rapidity.

Having thus described my invention, I claim 1. In a coffeemilhthe combination of the case B, having bearings in the sides, the shaft G, comprising the portion G', having' the reduced portion g on the inner end, and the portion G2, having the recess g2 therein to receive the said stud, the set-screw I in the end of the portion G2, and adapted to bear at the inner end against the end of the reduced portion g, and the disks L L, rigidly secured on the inner ends of the said portions G G2 of the shaft G,respectively,substantially as specifled.

2. In a coffee-mill, the combination of the case B, having bearings in the sides, the shaft G', journaled in one ofthe said bearings and having the shoulder g', and the reduced portion g on the inner end, the shaft G, journaled in the other bearing and having therecess gi extending longitudinally therethrough to receive the said reduced portion g, the inner side of the said recess g being lprovided l,

with a groove to receive the rib M ou the side of the stud, spiral spring coiled around the reduced portion g, between the end of the shaft G2 and the shoulder g on the shaft G', and

the thumb-screw I, operating in the threaded opening in the end of the shaft G and bearing at the inner end against the end of the reduced portion g, and the grinding-disks L L, secu red on theinner ends of the said shafts and adapted to be turned thereby within the case B, substantially as specified.

3. rIhe combination of the shaft consisting' my own I have hereto aixed my signature in presence of two witnesses.

JOSEPH P. HUMBLE. Witnessesz' W. F. WILLIAMS, J. B. CowARD. 

